Before you take them in, fully trickle charge them to max capacity and then try it. Check rating and if it holds a good charge for long or not.
Some people don't drive the vehicle enough to fully charge them.
And have them check when you are looking into buying new batteries. If they are still good, that's a pile of change wasted.
Are you throwing any codes ?


And it took me years to figure this out, but when I buy new batteries, I trickle charge them to max, then install.
Put on sealant to the connections when 1st installed, even Vaseline works.
When leaving the vehicle sit for two weeks or longer, put a trickle charger on them. I charge mine if it sits a week.
Heck, I get minimum of 10 years out of them doing it this way.